Back in the day, i used to love games like Money Island which took you everywhere looking for clues. Are there any games like that anymore ? If not, why not ?!? They were classics. Monkey island/sam & max/leisure suit larry etc.
You might like to try Syberia and Postmortem, recentish Point and Click adventures, something older but an utterly brilliant game is Sanitarium http://uk.gamespot.com/pc/adventure/sanitarium/index.html